Pipe-coupling.



CHARLES R. SCHMIDT, OF BALTIMORE, MARYLAND.

PIPE-COUPLING.

Specification of Letters Patent.

, Patented Oct. 22, 1907'.

Application led December 14. 1906. Serial No. 347,861.

.To all whom it may concern:

Be it known that I, CHARLES R. SCHMIDT, a citizen 'of the United States, residing at Baltimore, in the county of City of Baltimore and State oi Maryland, have invented certain new and useful Improvements in Pipe-Couplings, of which the following is a specilication.

This invention has relation to pipe couplings, and especially to couplings for cast iron pipes oi large diameter, such as are used for the conveyance oi fluids or gases under pressure. l

The object oi this invention is to overcome the objections to the use of andthe disadvantages of Wrought iron bolts in coupling pipes having ground or machined ends. As is Well known Wrought iron, or steel bolts, particularly When applied to pipes laid under ground or subjected to moisture or atmospheric influences, are liable to corrosion, by which the bolts are destroyed and leakage produced. f

With this object in view my invention consists in the combination with the other coupling elements of alined pipes, comprising bell or laucet and'spigot ends, surrounding Iianges, and bolts passing through said Ilanges, of clamps constituting supplementary fastenings, and serving to adequately hold the parts together and maintain a tight joint in the event of any corrosion or other accidental impairment of the bolts.

In the accompanying drawing: Figure -l, is a longitudinal sectional view of two'alined and coupled sections of pipe, having my improvement embraced in the coupling. Fig. 2, is a transverse section oi the same. Fig. 3, is a top view of the same.

l and 2 designate tivo lengths or sections'of pipe, one of which is represented with a bell end 3, and a flange 4, having a plurality of external radial lugs 4, and the other with a spigot end 5, entering the bell 3, and having also a flange 5/ and a plurality of lugs 6, similar to the lugs 4. The inner surface of the bell and the outer surface oi the spigot ale usually machined or ground, and tapered.

7, 7, designate the bolts passing transversely through the lugs 4, 6, and having nuts 8, 8, to tighten up the parts. y

To provide for the application of the clamps 9 and l0, the lugs 4/ and G, are recessed or channeled on opposite sides of the bolt holes as shown at ll and l2, ior the reception of the clamps which are U shaped castings, the legs of which are slightly divergent, so

that they may be Wedge driven or pressed on to the lugs alter the bolts have been tightened up, and will exert a pressure oi their own due to their elasticity.

The clamps l0, are held in place and prevented from being accidentally displaced, by slightly dovetailing the recesses ll, and correspondingly shaping the legs oi the clamps l0.

The clamps may be strengthened by forming them with exterior flanges, or making them T shaped in cross sectionA What I claim is:

l. A pipe section or length, having exterior lugs transversely pierced for bolts, and grooved transversely of the pipe and at an oblique angle with its xis, for the reception ot clamps.

2. In couplings for pipes, the combination with the sections or length of pipe having external lugs with gr oves or recesses disposed transverselyv of the pipe and at an oblique angle to its axis, and bolts passingl transversely through said lugs, of clamps embracing the lugs` and seated in said grooves or recesses.

3. A pipe section having exterior lugs at each end, said lugs being grooved transversely of the pipe and at an oblique angle to its longitudinal axis, for the reception of clamps.

4. In couplings for pipes the combination with pipe secA tions having external circumferential projecting portions grooved transversely of the pipe and at an oblique angle io the axis of the pipe. et' clamps fitting' in said grooves.

5. In couplings for pipes, the combination with pipe secY tions, having external circumferential projecting portions grooved transversely of the axis of the pipe, ot clamps embracing said lugs und adjustable transversely of the pipe.

(i. In couplings for pipes, the combination with pipe sections, having external circumferential lugs, of clamps em bracing said lugs and movable transversely of the pipe axis.

7. In couplings for pipes, the combination of pipe sections having external circumferential lugs, of clamps em bracing said lugs; and having the clamping members tapered or converging towards each other.

S. In pipe couplings, the combination with pipe sections having external. circumferential lugs, of elastic metallic clamps embracing said lugs.

5). In pipe couplings, pipe sections having external cir cumferential lugs. each having two grooves disposed transversely of' the axis of the pipe, and running respectivelyv at opposite oblique angles. l'

In testimony whereof I aiix my signature, in presence of two witnesses.

CHARLES R. SCHMIDT.

Witnesses Trios. A. CoxxoLLr, Jos.A B. CoNxoLLx. 

